IT1041177B - DEVICE EQUIPPED WITH FILTERING GRID - Google Patents

DEVICE EQUIPPED WITH FILTERING GRID

Info

Publication number
IT1041177B
IT1041177B IT5087175A IT5087175A IT1041177B IT 1041177 B IT1041177 B IT 1041177B IT 5087175 A IT5087175 A IT 5087175A IT 5087175 A IT5087175 A IT 5087175A IT 1041177 B IT1041177 B IT 1041177B
Authority
IT
Italy
Prior art keywords
grid
band
mirrors
beams
resultant beam
Prior art date
Application number
IT5087175A
Other languages
Italian (it)
Original Assignee
Thomson Csf
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Thomson Csf filed Critical Thomson Csf
Application granted granted Critical
Publication of IT1041177B publication Critical patent/IT1041177B/en

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q19/00—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic
    • H01Q19/10—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces
    • H01Q19/18—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces having two or more spaced reflecting surfaces
    • H01Q19/19—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces having two or more spaced reflecting surfaces comprising one main concave reflecting surface associated with an auxiliary reflecting surface
    • H01Q19/191—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces having two or more spaced reflecting surfaces comprising one main concave reflecting surface associated with an auxiliary reflecting surface wherein the primary active element uses one or more deflecting surfaces, e.g. beam waveguide feeds
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
    • H01Q15/0006—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices
    • H01Q15/0013—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices said selective devices working as frequency-selective reflecting surfaces, e.g. FSS, dichroic plates, surfaces being partly transmissive and reflective
    • H01Q15/0033—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices said selective devices working as frequency-selective reflecting surfaces, e.g. FSS, dichroic plates, surfaces being partly transmissive and reflective used for beam splitting or combining, e.g. acting as a quasi-optical multiplexer

Landscapes

  • Aerials With Secondary Devices (AREA)

Abstract

1512681 Multi-band aerial system THOMSONCSF 8 Aug 1975 [9 Aug 1974] 33249/75 Heading H4A [Also in Division H1] A multi-band aerial system comprises an e-m wave filter grid of substantially uniformly spaced metal elements on a dielectric substrate, the grid being transmissive to a first frequency band and reflective to a second, higher frequency band. First and second primary feeds direct first and second beams, respectively in the two frequency bands, onto respective opposed faces of the grid such that on leaving the grid the two beams merge into a resultant beam, outside the path of which the second primary feed is located. Fig. 4 shows a Cassegrain system of mirrors 80, 81, scanning in azimuth and elevation, onto which the resultant beam is directed by mirror 82. Grid 86 reflects the higher frequency band, fed from source S2 via mirrors 88, 87, and passes the lower frequency band, fed from source S1 via mirrors 85, 84, 83. In the Fig. 7 embodiment the filter grid 31 in horn 30 combines the beams from a dual-band high frequency (11 and 14 GHz bands) multiplexer-demultiplexer 33 with the beams from a dual-band low frequency (4 and 6 GHz) multiplexer-demultiplexer 32. An embodiment using a plane filter grid and plane mirrors instead of the curved grid 86 and curved mirrors 83, 84, 87 is described (Fig. 5, not shown). In other embodiments the filter grid forms a curved wall of a horn (Fig. 2, not shown) or is used to direct the resultant beam upward to a mast-supported mirror which is angled to direct the resultant beam horizontally (Fig. 3, not shown).
IT5087175A 1974-08-09 1975-08-08 DEVICE EQUIPPED WITH FILTERING GRID IT1041177B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7427766A FR2281660A1 (en) 1974-08-09 1974-08-09 DEVICE EQUIPPED WITH A FILTER GRID

Publications (1)

Publication Number Publication Date
IT1041177B true IT1041177B (en) 1980-01-10

Family

ID=9142312

Family Applications (1)

Application Number Title Priority Date Filing Date
IT5087175A IT1041177B (en) 1974-08-09 1975-08-08 DEVICE EQUIPPED WITH FILTERING GRID

Country Status (3)

Country Link
FR (1) FR2281660A1 (en)
GB (1) GB1512681A (en)
IT (1) IT1041177B (en)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2429505A1 (en) * 1978-06-20 1980-01-18 Thomson Csf PERISCOPIC FEEDING SYSTEM FOR TWO-RANGE ANTENNA
CA1198811A (en) * 1981-02-09 1985-12-31 Susumu Tamagawa Antenna apparatus including frequency separator having wide band transmission or reflection characteristics
FR2525823A1 (en) * 1982-04-27 1983-10-28 Thomson Csf DEVICE FOR EXCITATION OF A BI-BAND HYPERFREQUENESS GROOVE SOURCE
FR2535904B1 (en) * 1982-11-09 1985-08-02 Thomson Csf POWER ROTATING JOINT FOR DOUBLE BAND ANTENNA
FR2540296A1 (en) * 1983-01-31 1984-08-03 Thomson Csf SPATIAL CIRCULAR POLARIZING ELECTROMAGNETIC WAVE FILTER AND CASSEGRAIN ANTENNA COMPRISING SUCH A FILTER
DE3402659A1 (en) * 1984-01-26 1985-08-01 Messerschmitt-Bölkow-Blohm GmbH, 8012 Ottobrunn REFLECTOR ANTENNA FOR OPERATION IN MULTIPLE FREQUENCY RANGES
DE3431986A1 (en) * 1984-08-30 1986-03-06 Messerschmitt-Bölkow-Blohm GmbH, 8012 Ottobrunn POLARIZATION SEPARATING REFLECTOR
CN103746187B (en) * 2013-12-23 2015-09-23 北京邮电大学 A kind of Cassegrain antenna detection system and method for designing thereof
WO2022053160A1 (en) * 2020-09-14 2022-03-17 Huawei Technologies Co., Ltd. Apparatus for feeding two radio waves into an offset reflector

Also Published As

Publication number Publication date
GB1512681A (en) 1978-06-01
FR2281660B1 (en) 1978-01-27
FR2281660A1 (en) 1976-03-05

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